Safety lock



FIG. 1 is a perspective view of a safety lock showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the safety lock in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a safety lock, as shown and described. 